Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Nanoparticles having oligonucleotides attached thereto and uses therefor

Inactive Publication Date: 2005-06-07
NORTHWESTERN UNIV +1
View PDF77 Cites 58 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]The invention provides methods of detecting nucleic acids. In one embodiment, the method comprises contacting a nucleic acid with a type of nanoparticles having oligonucleotides attached thereto (nanoparticle-oligonucleotide conjugates). The nucleic acid has at least two portions, and the oligonucleotides on each nanoparticle have a seq

Problems solved by technology

However, these methods are complicated, time-consuming and / or require the use of specialized and expensive equipment.
The drawbacks of this method are that the process is difficult to control and the assemblies are formed irreversibly.
However, the theory of producing DNA structures is well ahead of experimental confirmation.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Nanoparticles having oligonucleotides attached thereto and uses therefor
  • Nanoparticles having oligonucleotides attached thereto and uses therefor
  • Nanoparticles having oligonucleotides attached thereto and uses therefor

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Oligonucleotide-Modified Gold Nanoparticles

A. Preparation of Gold Nanoparticles

[0250]Gold colloids (13 nm diameter) were prepared by reduction of HAuCl4 with citrate as described in Frens, Nature Phys. Sci., 241, 20 (1973) and Grabar, Anal. Chem., 67, 735 (1995). Briefly, all glassware was cleaned in aqua regia (3 parts HCl, 1 part HNO3), rinsed with Nanopure H2O, then oven dried prior to use. HAuCl4 and sodium citrate were purchased from Aldrich Chemical Company. Aqueous HAuCl4 (1 mM, 500 mL) was brought to reflux while stirring. Then, 38.8 mM sodium citrate (50 mL) was added quickly. The solution color changed from pale yellow to burgundy, and refluxing was continued for 15 min. After cooling to room temperature, the red solution was filtered through a Micron Separations Inc. 1 micron filter. Au colloids were characterized by UV-vis spectroscopy using a Hewlett Packard 8452A diode array spectrophotometer and by Transmission Electron Microscopy (TEM) using a Hitachi ...

example 2

Formation of Nanoparticle Aggregates

A. Preparation of Linking Oligonucleotide

[0259]Two (nonthiolated) oligonucleotides were synthesized as described in part B of Example 1. They had the following sequences:

[0260]

3′ ATATGCGCGA TCTCAGCAAA; and[SEQ ID NO:1]3′ GATCGCGCAT ATCAACGGTA.[SEQ ID NO:2]

[0261]Mixing of these two oligonucleotides in a 1 M NaCl, 10 mM phosphate buffered (pH 7.0) solution, resulted in hybridization to form a duplex having a 12-base-pair overlap and two 8-base-pair sticky ends. Each of the sticky ends had a sequence which was complementary to that of one of the oligonucleotides attached to the Au colloids prepared in part C of Example 1.

B. Formation of Nanoparticle Aggregates

[0262]The linking oligonucleotides prepared in part A of this example (0.17 μM final concentration after dilution with NaCl) were added to the nanoparticle-oligonucleotide conjugates prepared in part C of Example 1 (5.1 nM final concentration after dilution with NaCl) at room temperature. The so...

example 3

Preparation of Oligonucleotide-Modified Gold Nanoparticles

[0270]Gold colloids (13 nm diameter) were prepared as described in Example 1. Thiol-oligonucleotides [HS(CH2)6OP(O)(O−)-oligonucleotide] were also prepared as described in Example 1.

[0271]The method of attaching thiol-oligonucleotides to gold nanoparticles described in Example 1 was found not to produce satisfactory results in some cases. In particular, when long oligonucleotides were used, the oligonucleotide-colloid conjugates were not stable in the presence of a large excess of high molecular weight salmon sperm DNA used as model for the background DNA that would normally be present in a diagnostic system. Longer exposure of the colloids to the thiol-oligonucleotides produced oligonucleotide-colloid conjugates that were stable to salmon sperm DNA, but the resulting conjugates failed to hybridize satisfactorily. Further experimentation led to the following procedure for attaching thiol-oligonucleotides of any length to gold...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Timeaaaaaaaaaa
Molar densityaaaaaaaaaa
Acidityaaaaaaaaaa
Login to View More

Abstract

The invention provides methods of detecting a nucleic acid. The methods comprise contacting the nucleic acid with one or more types of particles having oligonucleotides attached thereto. In one embodiment of the method, the oligonucleotides are attached to nanoparticles and have sequences complementary to portions of the sequence of the nucleic acid. A detectable change (preferably a color change) is brought about as a result of the hybridization of the oligonucleotides on the nanoparticles to the nucleic acid. The invention also provides compositions and kits comprising particles. The invention further provides methods of synthesizing unique nanoparticle-oligonucleotide conjugates, the conjugates produced by the methods, and methods of using the conjugates. In addition, the invention provides nanomaterials and nanostructures comprising nanoparticles and methods of nanofabrication utilizing nanoparticles. Finally, the invention provides a method of separating a selected nucleic acid from other nucleic acids.

Description

[0001]This application is a continuation of application Ser. No. 09 / 603,830, filed Jun. 26, 2000, now U.S. Pat. No. 6,506,564, which was a continuation-in-part of application Ser. No. 09 / 344,667, filed Jun. 25, 1999, now U.S. Pat. No. 6,361,944, which was a continuation-in-part of application Ser. No. 09 / 240,755, filed Jan. 29, 1999, now abandoned, which was a continuation-in-part of pending PCT application PCT / US97 / 12783, which was filed Jul. 21, 1997. Benefit of provisional applications Nos. 60 / 031,809, filed Jul. 29, 1996, and 60 / 200,161, filed Apr. 26, 2000, is also hereby claimed.[0002]This invention was made with government support under National Institutes Of Health (NIH) grant GM10265 and Army Research Office (ARO) grant DAAG55-0967-1-0133. The government has certain rights in the invention.FIELD OF THE INVENTION[0003]The invention relates to methods of detecting nucleic acids, whether natural or synthetic, and whether modified or unmodified. The invention also relates to ma...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C07H21/00C12Q1/68C07B61/00B82B1/00C40B40/06
CPCB82Y5/00B82Y15/00B82Y30/00C07H21/00C12Q1/6813C12Q1/6816C12Q1/6818C12Q1/6825C12Q1/6827C12Q1/6834C12Q1/6837C12Q1/6839B01J2219/00274Y10S977/924B01J2219/00585B01J2219/00596B01J2219/00603B01J2219/00648B01J2219/00653B01J2219/00659B01J2219/00702B01J2219/00722B82B1/00C07B2200/11C40B40/06B01J2219/005C12Q2563/155C12Q2563/143C12Q2537/143C12Q2525/197C12Q2565/625C12Q2537/125C12Q2525/161
Inventor MIRKIN, CHAD A.LETSINGER, ROBERT L.MUCIC, ROBERT C.STORHOFF, JAMES J.ELGHANIAN, ROBERTTATON, THOMAS A.
Owner NORTHWESTERN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com